Provided is a moving body capable of smoothly traveling over a curved portion of a track.　A first inner wheel 12a, a first outer wheel 14a, a second inner wheel 12b, and a second outer wheel 14b provided on a moving body 10 have an arrangement relationship wherein a trajectory T1 of an intersection P1 of a first extension L1 of a line connecting the first outer wheel 14a and the first inner wheel 12a to each other and a second extension L2 of a line connecting the second outer wheel 14b and the second inner wheel 12b to each other forms an arc having a radius rcr satisfying Expression 1 when the moving body 10 travels over a curved portion 30a. Expression 1: (rin+rout)/2-{(rin+rout)/2}×3/10≤rcr≤(rin+rout)/2+{(in+rout)/2}×3/10, where Rin: radius of inner rail 32 in curved portion 30a, Rout: radius of outer rail 34 in curved portion 30a